Boring jig for door locks



Aug. 29,1967 NOE ET A; 3,338,277

BORING JIG FOR DOOR LOCKS Filed May 6, 1966 2 Sheets-Sheet 1 aud .United States Patent Ofi ice 3,338,277 BORING HG FOR DOOR LOCKS JohnAxel Tornoe and Robert A. Marotto, Redwood City, Calif., assignors toSchlage Lock Company, a corporation Filed May 6, 1966, Ser. No. 548,2556 Claims. (Cl. 144-27) ABSTRACT OF THE DISCLOSURE A boring jig for doorlocks has a central frame carrying clamp plates with circular toolguides for engaging opposite faces of a door. The clamp plates areequally moved in opposite directions from the central frame by a looselyfitting screw shaft and may pivot slightly about a separate fulcrum.Boring sleeves slidable in the central frame carry an abutment plateengageable with the door edge to locate the circular tool guides atselected distances from the door edge.

Our invention relates to tools particularly adapted for use by anartisan in preparing a door for the installation of a door lock thereon.

At the present time many door locks are made for installation in a doorsimply by the provision of one transverse hole extending through thedoor panel and another intersecting hole extending inwardly from thedoor edge. Other locks employ a number of intersecting holes arranged invarious combinations, some passing transversely through the door paneland others extending inwardly from the door edge. It is important inpreparing a door for lock installation that the holes be accuratelybored at the appropriate locations with the appropriate angles ofintersection and with the appropriate spacing so that the lock can besimply mounted with little or no additional fitting or labor. Doors onwhich the locks are installed may vary in thickness not only from doorto door for constructional or architectural reasons, but also from timeto time since the material of the door may change in dimensions. Theinstallation of locks can be made at dilferent arbitrary or selectedlocations particularly with respect to height and to the amount ofbackset or distance of the rotational axis of the door knob or spindlefrom the door edge.

It is therefore an object of the invention to provide a single toolwhich can be utilized by an ordinary workman on any of the normallyencountered doors and which also will permit the preparation of the doorfor the reception of any one of a large number of locks of diiferentconstructional design.

Another object of the invention is to provide a boring jig for doorlocks that will accommodate many of the boring or cutting tools nowavailable.

Another object of the invention is to provide a boring jig for doorlocks that can be easily and accurately mounted on any door panelnormally encountered and will firmly and rigidly stay in place untilremoved.

Another object of the invention is to provide a boring jig which can beso closely engaged with the door as to avoid tearing or splintering bythe cutting tools in the event the door is of material which isotherwise subject to that action.

A further object of the invention is to "g which is relatively light andeasy to be manufactured economically.

A further object of the invention is to provide a boring "g which iseasily set on the job to accommodate the particular door encountered andto provide for the installation of the particular lock to be utilized.

A further object of the invention is in general to improve boring jigsfor door locks.

provide a boring handle and can 3,338,27 7 Patented Aug. 29, 1967 Otherobjects together with the foregoing are attained in the embodiments ofthe invention described in the accompanying description and illustratedin the accompanying drawings, in which:

FIGURE 1 is a side elevation of the boring jig for door locks mounted ona door being prepared for the reception of a door lock;

FIGURE 2 is a plan of the mechanism of FIGURE 1, the door beingdisclosed in cross section on a horizontal plane;

FIGURE 3 is a view in cross section, the plane of section beingindicated by the line 3-3 of FIGURE 2;

FIGURE 4 is a view in cross section, the plane of section beingindicated by the line 4-4 of FIGURE 2; and

FIGURE 5 is a detail showing a modification of one portion of the boringjig mechanism.

In most instances, locks are installed on doors already hung, andreferences to directions herein assume that condition, but some locksare factory installed or machine installed on doors prior to hanging andin various attitudes. The present tool is also useful in thatenvironment.

While it can be embodied in a number of diiferent practical forms, theboring jig in accordance with this invention has been particularly made,as shown herein, especially for use in connection with a door panel 6.This panel includes an upright stile having an edge surface 7 which maybe at right angles to the side surfaces 8 and 9 or may be beveled orinclined with respect thereto. The surfaces 8 and 9 are usually parallelto each other and are a predetermined, nominal distance apart. Thisdistance varies from a relatively close spacing in thin doors to arelatively wide spacing for thick doors. The material of the panel 6 isordinarily, wood although metal doors and composite doors are sometimesencountered. One of the purposes of the boring jig is to assist in theboring in the panel of a transverse, horizontal bore 11 of relativelylarge diameter. The bore 11 is circular about a transverse axis 12extending at right angles to the planes of the surfaces 8 and 9. Thebore 11 extends clear through the door panel and at a median location isintersected by a bore 13 of relatively smaller diameter. The bore 13 iscircular cylindrical about an axis 14 that intersects the axis 12 atright angles. The bore 13 extends horizontally inwardly from the edge 7to its intersection with the bore 11. This is the simplest boring job.Others may require a number of transverse bores, a number of edge bores,or both.

Pursuant to the invention, there is provided a boring jig for the lockto be installed in the door and since this lock may be one which isrelatively simple, having but a single cross bore and a single edgebore, or may be a complex one, having a plurality of cross bores and aplurality of edge bores, the preferred form of jig is arranged toaccommodate any of these locks so that the workman can use any one ormore of the portions of the jig, as required.

For this reason, the boring jig is provided with a central frame 21conveniently of cast metal configured to define a pair of boring guides22 and 23. These guides are circular cylindrical in interiorconfiguration and are symmetrical about a pair of parallel axes 24 and26 arranged horizontally in a central, vertical plane coinciding withthe axis 14.

Located in the central frame 21 is a pair of support spindles 27 and 28.These are horizontal rods extending with their axes 29 and 31 parallelto each other and normal to the central plane of the device. The rodsextend about equal distances on opposite sides of the central plane. Thesupport spindles are fixed in position by fastening pins 32 and 33.

Designed to slide transversely on is a pair of clamp plates 36 and 37.These plates are substantially identical so that the description of oneapplies the support spindles equally to the other. Each of the platesincludes a pair of bosses 38 and 39 arranged for sliding movement on thespindles 27 and 28. The bosses are connected by a central web 41 havingreinforcing ribs 42 therein. At some distance from the bosses 38 and 39the web 41 is expanded vertically to provide integral rings 43, 44 and46 defining circular cylindrical, tool guide apertures 47 transverselyaligned with each other. The tool guides 47 are of appropriate diameterto receive, locate and guide cutting or boring tools of the customarysort designed to produce the bores in the door panel.

In order that the clamp plates 36 and 37 can be appropriately movedapproximately symmetrically on either side of the central plane andalways in approximate parallelism with each other, an appropriatedriving means is provided. For that reason, there is centrallyjournalled in the central frame 21 a screw shaft 51 mounted for rotationin the central frame and confined against axial translation by lockrings 52 and 53. The screw shaft 51 on either side of its centralportion is provided with oppositely handed threads 54 and 56. Thesethreads are respectively engaged with the threaded interior of bosses 57and 58 incorporated in the clamp plates 36 and 37.

One end of the screw shaft has a stop washer 61 held thereon by a snapring 62 and the other end of the screw shaft is extended and receives ahandle 63 secured in position by a nut 64 so that the screw shaft can bemanually rotated in either direction within the central frame. When thescrew shaft is so rotated, the threads '54 and 56 of opposite hand movethe clamp plates simultaneously either toward each other or away fromeach other in equal amounts with respect to the central plane of thedevice. However, the fit between the threads and on the support.spindles is relatively loose so that the clamp plates need not always beexactly parallel to each other, but may swing slightly to converge ordiverge, as viewed in FIGURE 2.

In order that the clamp plates may be effectively and properly clampedon the door by a sort of lever action, means are provided for limitingthe approaching movement of the clamp plates.

While both of the clamp plates have bosses 66 and 67, the boss 66 isleft solid in order to afford an abutment surface 68, but the boss 67 isthreaded to receive a screw 69 having a thumb turn 71 at one end. Theother end of the screw has a flat surface 72 designed to abut with thesurface 68. A clamp ring 73 is put on the threads of the screw 69. Theposition of the screw 69 is variable or adjustable so that the distancebetween the facing surfaces of the bosses 66 and 67 can be stopped in aspaced position approximately or exactly equivalent to the doorthickness. Then when the handle 63 is properly rotated, the clamp plates36 and 37 are moved toward each other until such time as the surfaces 68and 72 come into contact. Further turning movement of the handle thencauses the guide plates slightly to pivot or cock about a vertical axisat the end of the screw 69 as a fulcrum and to shift slightly on thesupport spindles and on the relatively loose threads of the screw shaft51. The slight looseness of the fit of the spindles and of the screwshaft also allows some pivoting or cocking about a horizontal axis sothat any slight lack of parallelism in the door surfaces 8 and 9 isimmaterial. This causes all of the rings 43, 44 and 46 substantiallysimultaneously to come into contact with and to be firmly squeezedagainst the surfaces 8 and 9 of the door. Once an appropriate settingfor a particular series of doors has been fixed by the screw 69, thelock ring 73 can be set or jammed so that no further tampering with thisadjustment is necessary.

The reverse rotation of the handle 63 frees the binding in the screwshaft threads and releases the boring jig by separating the clamp plates36 and 37 from each other.

Means are provided for guiding the tool or tools that make one or bothof the bores extending in from the edge of the door. For that reason,Within the boring guides 22 and 23 a pair of substantially similarboring sleeves 81 and 82 are reciprocably mounted. The circularcylindrical sleeves 81 and 82 have the same axes 24 and 26 as do theboring guides 22 and 23. The sleeves 81 and 82 are at one end joined byan abutment plate 83 having linear stops 84 and 86 thereon designed toabut the central portion of the edge 7 of the door. The boring sleevesare moved simultaneously and by hand to and fro along their axes andwith respect to the central frame.

The position of the boring sleeves depends upon the amount of backset.The boring sleeve 81 has a plurality of apertures 87, 88, 89 and 91therein designed to receive a spring pin 92 slidably mounted in thecentral frame. The pin 92 has a projecting cone point 93 forinterengagement in the various openings 87, 88, 89 and 91 and isprovided with a spring 94 for urging the parts into interengagement. Thespring 94 is releasably held in position by a screw sleeve 96 threadedinto the central frame. The upper end of the pin 92 carries a fingerbutton 97 so that the pin can be temporarily retracted from the openingsby compression of the spring 94. When the button 97 is lifted, theboring sleeves can be moved approximately into any one of the desiredpositions. When the pin 92 is released, it engages into the subjacentone of the holes such as 87 and then holds the parts in accurateposition with the abutment plate 83 in appropriate dimensionalrelationship with the cross axes 12 of the rings 43, 44 and 46.Conveniently, indicia 101, 102, 103 and 104 are marked on or cast intothe interior surface of the clamp plates so that indices 105 and 106 onthe abutment plate will indicate by their proximity each of theparticular settings or backsets of the boring jig.

To assist in positioning the boring jig initially at the proper height,each of the clamp plates is provided with a pair of linear, elongatedopenings 107 and 108 therethrough so that a scribe line or a pencil markon the door at the desired height can be readily seen and will serve asan appropriate guide for the initial vertical positioning of the boringjig. Indicia, not shown, can be placed on the clamp plates to aid inselecting the proper opening 107 or 108 for a particular size or designof lock.

In the use of this structure, after a 'height line is provided on thedoor the adjusting screw 69 is set at the door thickness, the boringsleeves 81 and 82 are set at the desired backset value as indicated bythe indicia 101, etc., and the boring jig is then positioned around thedoor panel 6. The handle 63 is then rotated to tighten the clamp platesagainst the sides of the door, the final movement urging the rings 43,44 and 46 into very firm engagement with the door surfaces. Appropriatecutting tools are then guided within the se lected ones of the rings 43,44 and 46 to provide the cross bores necessary for the particular lockunit being installed. Then appropriate cutting or boring tools aretraversed through one or both of the sleeves 81 and 82 also to providethe proper bores from the door edge. During these operations, the partsof the jig are close enough to the surface of the door so thatspliniters are not likely to result. Following this operation, thehandle 63 is rotated in the reverse direction sufficiently releasing theclamp plates and the boring jig is then removed for subsequent use.

In some instances it is desired to clamp one or more of the rings 43, 44and 46 extra tightly against the surface of the door, particularly toavoid splintering if the door is bored from one side only. Asparticularly shown in FIGURE 5, in this instance one set of the clamprings such as 43 is not disturbed, but the opposite set of clamp ringssuch as 111 is bored out and is threaded to receive a sleeve 112. Anirregular rim 113 assists in manual rotation of the sleeve 112 in andwith respect to the ring 111. In this instance after the boring jig hasbeen brought very nearly into place, the operator turns the roughenedportion 113 and thus drives the advancing edge 114 of the ring intoextremely firm engagement with the door, perhaps slightly deforming thewood. Then the boring tool in traversing the door, even just one side,cannot break splinters when it emerges from the other side. It ispreferred that the member 112 be of reasonably soft, plastic material sothat a cutting tool engaging it, after having passed through the door,is not dulled.

What is claimed is:

1. A boring jig for door locks comprising a central frame, meansincluded in said central frame and defining at least one boring guidearranged with its axis in a central plane, a pair of support spindles,means for mounting said support spindles in said central frame and toextend from opposite sides thereof parallel to each other and normal tosaid central plane, a pair of clamp plates disposed on opposite sides ofsaid frame and slidably and loosely mounted on said support spindlesleaving play therebetween, means included in each of said clamp platesand defining one or more tool guides in alignment with the correspondingtool guides of the other of said clamp plates, a screw shaft havingoppositely threaded ends loosely engaging said clamp plates leaving playbetween said screw shaft and said clamp plates, means for mounting saidscrew shaft in said central frame solely for rotation therein, means forrotating said screw shaft, and means projecting from one of said clampplates on the opposite side of said screw shaft from said tool guidesand adapted to abut a portion of the other of said clamp plates on theopposite side of said screw shaft from said tool guides and serving as afulcrum to cause said tool guides to approach each other and to take upsaid play when said screw shaftis tightened following said abutment.

2. A boring jig as in claim 1 and including boring sleeves reciprocablymounted in said boring guides, an abutment plate secured to said boringsleeves, and means for releasably holding said boring sleeves in any oneof several reciprocated positions in said boring guides.

3. A boring jig as in claim 2 and including means on said abutment plateand at least one of said clamp plates for indicating the position ofsaid boring sleeves in said boring guides.

4. A boring jig as in claim 1 in which at least one of said tool guidesis provided with a sleeve mounted to move toward and away from anopposite one of said tool guides.

5. A boring jig as in claim 1 in which at least one of said tool guideshas an edge adapted to project from said tool guide toward the oppositetool guide.

6. A boring jig for door locks comprising a central frame having aboring guide therein extending along a longitudinal axis, a pair ofclamp plates disposed on opposite sides of said central frame, means oneach of said clamp plates defining a tool guide, said tool guides beingin alignment on a transverse axis, boring sleeves disposed in saidboring guides and reciprocable therein in the direction of saidlongitudinal axis, an abutment plate engaging said guide sleeves andlocated between one end of said central frame and said tool guides, andmeans interengageable with said central frame and at least one of saidguide sleeves for holding said abutment plate at any one of severaldistances from said end of said central frame.

References Cited UNITED STATES PATENTS 90,299 5/ 1869 Pfleghar 77-62310,710 I/ 1885 Nichols 77-62 824,306 6/ 1906 Means 7762 2,602,238 7/1952 Wellman 7762 X 2,641,147 6/ 1953 Sulc 144-27 2,763,299 9/ 1956 Cerf77-62 2,792,727 5/ 1957 McCuen 7762 2,843,167 7/1958 Rushton 144-273,212,366 10/ 1965 Russell 7762 WILLIAM W. DYER, JR., Primary Examiner.RALPH JAY ZLOTNIK, Assistant Examiner.

1. A BORING JIG FOR DOOR LOCKS COMPRISING A CENTRAL FRAME, MEANSINCLUDED IN SAID CENTRAL FRAME AND DEFINING AT LEAST ONE BORING GUIDEARRANGED WITH ITS AXIS IN A CENTRAL PLANE, A PAIR OF SUPPORT SPINDLES,MEANS FOR MOUNTING SAID SUPPORT SPINDLES IN SAID CENTRAL FRAME AND TOEXTEND FROM OPPOSITE SIDES THEREOF PARALLEL TO EACH OTHER AND NORMAL TOSAID CENTRAL PLANE, A PAIR OF CLAMP PLATES DISPOSED ON OPPOSITE SIDES OFSAID FRAME AND SLIDABLY AND LOOSELY MOUNTED ON SAID SUPPORT SPINDLESLEAVING PLAY THEREBETWEEN, MEANS INCLUDED IN EACH SAID CLAMP PLATES ANDDEFINING ONE OR MORE TOOL GUIDES IN ALIGNMENT WITH THE CORRESPONDINGTOOL GUIDES OF THE OTHER OF SAID CLAMP PLATES, A SCREW SHAFT HAVINGOPPOSITELY THREADED ENDS LOOSELY ENGAGING SAID CLAMP PLATES LEAVING PLAYBETWEEN